In real life, walls are very thin so they don't take too much space, but in Minecraft they're a whole meter in length, height and depth. Imagine there being two rooms and from both rooms there are walls, but the colors are different for each room; so that will take you two entire blocks for a wall. So how cool would it be if you could do it to be a block thin, yet still have different colours on the side?
Let's call this a paintbrush. It's crafting recipe would be a stick down and the middle, with a random dye on the top. The paintbrush will have durability and will work in a way that when right-clicking the side of a block, it will get colored. This would be useful for coloring redstone signal so you can see what goes where, or maybe you can color sand, because why not.
And when you accidentally put color on something you don't want to be painted, you can craft a water brush to remove it by putting two more sticks in the crafting table, but with a water bottle on the top.
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If you think this is interesting or you have a suggestion, reply down vvv
I have seen this suggestion before, but someone suggested it as a wallpaper effect. You could use slimeballs and paper (maybe some color in there too like the banner crafting) to make a pattern. This pattern would be applied like the current item frame/map setup, allowing for the pattern to be used on the wall. Bam, wallpaper! You could make as many copies as you needed (maybe with a specialty block/workstation).
Unfortunately, vertical half slabs have already been shot down by Mojang. As cool as they would be.... not gonna happen.