You can use a set of Simple Line Icons. Example:
<i class="icon-user icons"></i>
.icon-user
.icon-people
.icon-user-female
.icon-user-follow
.icon-user-following
.icon-user-unfollow
.icon-login
.icon-logout
.icon-emotsmile
.icon-phone
.icon-call-end
.icon-call-in
.icon-call-out
.icon-map
.icon-location-pin
.icon-direction
.icon-directions
.icon-compass
.icon-layers
.icon-menu
.icon-list
.icon-options-vertical
.icon-options
.icon-arrow-down
.icon-arrow-left
.icon-arrow-right
.icon-arrow-up
.icon-arrow-up-circle
.icon-arrow-left-circle
.icon-arrow-right-circle
.icon-arrow-down-circle
.icon-check
.icon-clock
.icon-plus
.icon-close
.icon-trophy
.icon-screen-smartphone
.icon-screen-desktop
.icon-plane
.icon-notebook
.icon-mustache
.icon-mouse
.icon-magnet
.icon-energy
.icon-disc
.icon-cursor
.icon-cursor-move
.icon-crop
.icon-chemistry
.icon-speedometer
.icon-shield
.icon-screen-tablet
.icon-magic-wand
.icon-hourglass
.icon-graduation
.icon-ghost
.icon-game-controller
.icon-fire
.icon-eyeglass
.icon-envelope-open
.icon-envelope-letter
.icon-bell
.icon-badge
.icon-anchor
.icon-wallet
.icon-vector
.icon-speech
.icon-puzzle
.icon-printer
.icon-present
.icon-playlist
.icon-pin
.icon-picture
.icon-handbag
.icon-globe-alt
.icon-globe
.icon-folder-alt
.icon-folder
.icon-film
.icon-feed
.icon-drop
.icon-drawer
.icon-docs
.icon-doc
.icon-diamond
.icon-cup
.icon-calculator
.icon-bubbles
.icon-briefcase
.icon-book-open
.icon-basket-loaded
.icon-basket
.icon-bag
.icon-action-undo
.icon-action-redo
.icon-wrench
.icon-umbrella
.icon-trash
.icon-tag
.icon-support
.icon-frame
.icon-size-fullscreen
.icon-size-actual
.icon-shuffle
.icon-share-alt
.icon-share
.icon-rocket
.icon-question
.icon-pie-chart
.icon-pencil
.icon-note
.icon-loop
.icon-home
.icon-grid
.icon-graph
.icon-microphone
.icon-music-tone-alt
.icon-music-tone
.icon-earphones-alt
.icon-earphones
.icon-equalizer
.icon-like
.icon-dislike
.icon-control-start
.icon-control-rewind
.icon-control-play
.icon-control-pause
.icon-control-forward
.icon-control-end
.icon-volume-1
.icon-volume-2
.icon-volume-off
.icon-calendar
.icon-bulb
.icon-chart
.icon-ban
.icon-bubble
.icon-camrecorder
.icon-camera
.icon-cloud-download
.icon-cloud-upload
.icon-envelope
.icon-eye
.icon-flag
.icon-heart
.icon-info
.icon-key
.icon-link
.icon-lock
.icon-lock-open
.icon-magnifier
.icon-magnifier-add
.icon-magnifier-remove
.icon-paper-clip
.icon-paper-plane
.icon-power
.icon-refresh
.icon-reload
.icon-settings
.icon-star
.icon-symbol-female
.icon-symbol-male
.icon-target
.icon-credit-card
.icon-paypal
.icon-social-tumblr
.icon-social-twitter
.icon-social-facebook
.icon-social-instagram
.icon-social-linkedin
.icon-social-pinterest
.icon-social-github
.icon-social-gplus
.icon-social-reddit
.icon-social-skype
.icon-social-dribbble
.icon-social-behance
.icon-social-foursqare
.icon-social-soundcloud
.icon-social-spotify
.icon-social-stumbleupon
.icon-social-youtube
.icon-social-dropbox
