The default hotbar makes it hard to tell what the selected item is, so I replaced its texture. I also made the experience bar transparent (it partially overlaps the hotbar). And I cleaned up all inventory/chest forms to make them consistent.
If you want to try it, just unzip that file into ~/.minetest/textures/ (you might need to create the textures directory) and enable auouYmous-textures in the content tab of minetest. If you already have a texture pack, you can probably unzip it into your texture pack directory and it might just work.
You can remove the illuna, player_api and hud directories if you want original hotbar.
You can remove the 3d_armor, unified_inventory and technic_chests directories if you want original inventories.