You can change the font-size, color, drop shadow, and anything else that gets inherited using CSS.

Web & Mobile Application Icons

.account-box
.label
.accessibility
.view-quilt
.birthday
.check-box
.blank
.star-outline
.book
.bookmark
.bookmark-outline
.view-array
.bug-report
.home-button
.phone-forwarded
.underline-text
.insert-link
.insert-invitation
.car
.drive-eta
.car-changing-lanes
.settings-power
.check-box-outline
.polymer
.circle
.circle-check
.circles-extend-button
.circumference
.location-city
.clapperboard
.clock
.explore
.today
.group-add
.credit-card
.block
.done-all
.downwards
.language
.exit-to-app
.favorite
.favorite-outline
.filled
.theaters
.forward
.gmail
.fill-mood
.google
.google-glass
.google-pdf
.google-drive
.google-chrome
.google-drive-presentation
.google-drive-image
.hangouts-video-off
.google-analytics
.google-apps-script
.google-document
.google-drive-folder
.google-drive-file
.user-account-box
.google-drive-spreadsheet
.google-plus-pages
.graduate-cap
.star-halffilled
.help
.history
.home
.hotel
.https
.swap-vert
.label-outline
.list-filled
.list
.locked
.locked-outline
.magic
.grade
.mark-envelope
.settings-voice
.microsoft-word
.microsoft-excel
.photo
.mountains-inside
.launch
.tab-unselected
.notifications-none
.notifications-paused
.notifications
.perm-identity
.settings-phone
.google-earth
.printer
.progress-indicator
.puzzle
.radio-on
.random
.rate-star
.receipt
.reload
.reminder-bow
.info-outline
.remove-circle-outline
.error
.account-circle
.round-remove-fill
.rounded-info
.delete
.schedule
.news-screen
.search
.flip-to-back
.flip-to-front
.settings-cogwheel
.settings-inside
.shopping-basket
.shopping-cart
.show-menu
.settings-cell
.sms-bubble-speech
.sms-failed
.snake-game
.swap-vert-circle
.swap-horiz
.synchronization-arrows
.tack
.happy-tag
.thermostat
.view-column
.thumb-down
.thumb-up
.tick-inside
.visibility-off
.notifications-off
.notifications-on
.view-module
.account-child
.two-circles
.underline
.unlocked
.up
.user
.people
.verification-mark
.view-list
.visibility
.voice-message
.warning
.window
.work
.workspace
.world

Social

.blogger
.mood
.android
.facebook
.google-plus
.google-plus-fill
.google-hangout
.hangouts-videocall
.instagram
.linkedin
.pinterest
.plus-one
.poll
.share
.tumblr
.twitter
.youtube
.web-server
.whatshot

Notification

.adb
.bluetooth-audio
.sim
.disc-full
.play-download
.play-install
.sd-card
.system-update
.tap-and-play
.vibration
.vpn-lock
.videocall
.sync-problem
.phone-missed
.phone-locked
.phone-paused
.phone-bluetooth-speaker
.read-more
.sync
.mms

Maps

.beenhere
.directions
.man-cycling
.bus
.directions-car
.transit
.train
.subway
.man-walking
.airplane
.location-history
.location
.place
.map
.traffic
.parking
.gps-fixed-indicator
.landscape
.store

Communication

.call
.call-end
.call-made
.call-merge
.call-missed
.call-received
.call-split
.chat
.insert-comment
.dialpad
.write-email-envelope
.question-answer
.import-export
.live-help
.message
.messenger
.wifi-signal-waves
.ring-volume
.textsms
.voicemail

Content

.add
.square-add
.add-circle
.add-circle-outline
.archive
.backspace
.rounded-block
.clear
.content-copy
.content-cut
.clipboard
.create
.drafts
.filter-list
.waving-flag
.forward-clone
.inbox
.insert-link
.mail
.horizontal-line-remove
.remove-circle-outline
.round-remove-fill
.reply
.reply-all
.report
.save
.select-all
.send
.sort
.undo

File

.attachment
.cloud
.cloud-circle
.cloud-done
.cloud-download
.cloud-off
.cloud-queue
.cloud-upload
.file-download
.upload
.folder
.shared-folder

Hardware

.cast-connected
.google-cast
.dock
.gamepad
.headset
.headset-mic
.keyboard
.keyboard-right-arrow
.keyboard-left-arrow
.keyboard-backspace
.keyboard-capslock
.keyboard-hide
.keyboard-return
.tab
.laptop
.memory-chip
.mouse
.smartphone
.speaker
.tablet
.tv
.watch

Entertainment

.closed-caption
.fast-forward
.rewind
.games
.high-quality
.mic
.mic-none
.mic-off
.movie
.pause
.pause-circle-fill
.pause-circle-outline
.play-arrow
.play-circle-fill
.play-circle-outline
.replay
.shuffle
.play-next
.play-previous
.stop
.videocam
.videocam-off
.volume-mute
.volume-down
.volume-up
.volume-off
.website

Device

.set-alarm
.set-timer
.add-alarm
.airplanemode-on
.airplane-mode-off
.bluetooth
.bluetooth-disabled
.bluetooth-searching
.bluetooth-connected
.settings-bluetooth
.brightness-auto
.brightness-high
.brightness-low
.medium-brightness
.data-usage
.developer-mode
.gps-fixed-indicator
.gps-off
.gps-location-disabled
.gps-location
.network-cell
.network-wifi
.nfc
.screen-lock-landscape
.screen-lock-portrait
.screen-lock-rotation
.screen-rotation
.sd-storage
.wifi-low
.three-bar-wifi-signal
.medium-wifi-signal
.wifi-high
.high-signal
.low-signal
.medium-signal
.storage
.usb
.wifi-signal-waves

Image

.add-to-photos
.camera
.rotate-to-left
.rotate-to-right
.round-rgb
.rounded-adjust
.photo-album
.photo-frame
.photo-library
.party-mode
.portrait
.photo-camera
.camera-roll
.switch-camera
.crop
.crop-square
.crop-portrait
.crop-free
.iso
.filter-hdr
.flash-auto
.flash-on
.flash-off
.image
.landscape
.panorama
.invert-colors
.color-lens
.play-slideshow
.switch-camera
.switch-video
.timelapse
.wb-auto
.wb-cloudy
.wb-incandescent
.shining-sun
.shining-rectangular