Most of my students chose to do the marker route. I'm ok with that, they had fun with it.
This is how you "paint" with markers:
Don't have watercolors? Scared of them? No biggie! You can use crayola washable markers (really any water based marker). This was a happy accident that happened during my student's collaboration project. I love the effect as the marker bleeds. Simply draw what you want. Then you can use a wet paintbrush to bleed the marker.