Let's say you're hosting a racing minigame or gamemode, but you want to allow players to select the vehicle and it's color easier, I thought of the following, a modified vehicle spawn brick with a custom UI, that allows only the car selected by the gamemode/host in the list, with that the player can't choose something that is not fitting for the race (Example: You can event the brick choosing which vehicles can be spawned in, the ones which aren't chosen won't show up in it) And a button for Color, choosing a color from the colorset of the server, and maybe if possible, allowing the player to use the RGB Sliders to create a color for the car, once it's done he press Spawn and the vehicle is ready to use.
If possible I'll try to make a UI concept in here later, but I saw that guy who wanted to make an updated version of the speedkart gamemode, and I believe having this as an option would simplify things, so you don't have to event every single button and color bar on that wall next to you incase you want to add more karts. (I did that before when I hosted the speedkart gamemode with one new kart, and it was hell to event every single brick, in every single spawn, in every single track, just to add an extra kart)