How can I upcycle lampshades?

Paint them. Draw pictures on then & paint the design on. I painted a small one 3 yrs ago. I wanted purple & couldn't find one so i painted the color i wanted. Have fun.

https://www.pinterest.com/tickledpinktony/lampshades-upcycle-reuse-recycle-repurpose-diy/

I wallpapered mine.

Afton: here are some good ideas

https://www.diyncrafts.com/26537/repurpose/20-fantastic-lamp-repurposing-ideas-add-style-home-garden

If they are fabric shades you can dye them either solid or dip dye for an ombre affect.... https://www.ritdye.com/instructions/how-to-dye-a-lampshade/

ombre... https://www.ritdye.com/2018/05/02/dip-dyed-lamp-shade/

They have 2 formulas, one for natural fabrics and one for synthetic fabrics.

I used an old lamp shade to line a metal basket to update the boob light in my hallway. https://www.girljustdiy.com/boob-light-makeover/