Noun Project icons, sourced via Wikimedia Commons. SVG geometry is unchanged; CSS displays the icons in Plum.

connect.svg - Link by Matthew Exton, CC0 1.0
https://thenounproject.com/icon/1690
https://commons.wikimedia.org/wiki/File:Link_(1690)_-_The_Noun_Project.svg

calendar.svg - Calendar by New Haircut, CC0 1.0
https://thenounproject.com/icon/97558
https://commons.wikimedia.org/wiki/File:Calendar_(97558)_-_The_Noun_Project.svg

style.svg - Paint Brush by Christoffer Skogsmo, CC0 1.0
https://thenounproject.com/icon/250803
https://commons.wikimedia.org/wiki/File:Paint_Brush_-_The_Noun_Project.svg

palette.svg - Paint palette by James Fenton, Noun Project, CC BY 3.0
https://thenounproject.com/browse/icons/term/paint-palette/
https://commons.wikimedia.org/wiki/File:Paint_palette_icon_from_the_Noun_Project.svg
https://creativecommons.org/licenses/by/3.0/

sliders.svg - Sliders by Erik Vullings, CC0 1.0
https://thenounproject.com/icon/80374
https://commons.wikimedia.org/wiki/File:Sliders_(80374)_-_The_Noun_Project.svg

CC0 dedication: https://creativecommons.org/publicdomain/zero/1.0/