i have idea for big, content update - decorative update
first, some small ideas as recipe book sorting, tags (food, drink, eatable, material, buildable, machine and etc)
and floors (Mamode's idea)
and now about main update - paints
now you can find 5 types of paint geysers - red, yellow, blue, white, black
(that can be mined by hand or by "milking" it by GCB)
and now you can mix them in mixer (or inv.)
(you can make orange, green and purple with only RYB, dark and light variants if added W or B, and gray with W+B)
(so there is 21 type of paint)
and now by clicking RMB at any building with paint in hand it will paint it
and may by it will have 1 nutr.
but while I was writing this I thought of something else - terraforming
like now nuke that touching ore deposit hitbox destroy it after exploding
and now you can craft your own deposites (white chocolate+black honey+plutonium+3 of selected ore/paint/flower pots(for oasises))
i know that this ideas can be hard to implement in game, or they may not be suitable for the game, but these are just ideas I wanted to offer you