Character idea? (Patreon)

So I was able to do most of the work on the sketch, but I'm still guessing on what to do for the girl on the beach towel. I was thinking of my mascot (This one), but I'm thinking more of other eqg characters, aside from rarity, twilight, and pinkie.  I'm open to suggestions in the comments. I can also add another character in the background for fun, like what twily and ponk are doing to.