I would request a texture pack that makes the double tall grass prettier. The file is a tga and it can be tricky to make the grass look nice while still matching immersion into vanilla, but it would make gardening more fun.
Other ideas: (Not requests)
I noticed the cave vines don't have a bedrock retexture besides the wisteria one, so that one is a good candidate too. I was going to turn it into starfruit or something fantasy.
I edited pumpkins but if you make a pack to turn pumpkins into other fruit that would be appreciated too since I would like to wear lots of different fruit on my head.
I constantly retexture prismarine and end items because there is no real-life equivalent so we can turn it into whatever we want. These items might be good for an easy resource pack too.
If you want to do any pack and use mine as a starting point, I can send you all the texture files. Please just credit me when you publish them if you choose to do this. I personally use the blockbench web app and find it helps the process a lot.