Two more pages of doodles, here: [link]
(all side-story doodles I don't feel like uploading because lazies).
This would be the best crossover, ever. Cutest, for sure. Just have to handicap the pegasi and alicorns. The cheaters.
I just love that even though Silver's farther back on the picture plane, she's half-again the size of weedy-P21. Poor fella. (Also: I so ship those two in my weird fantasy-brain-land as having a lavender marriage, now. Just because it'd be hilarious. >.>)
From left to right:
P-21 and Scotch Tape from Project Horizons
Silver Storm and Serenity from Heroes
Aurora Borealis and Silent Requiem from New Beginnings
(on the horizon doing a sonic radboom) Ditzy and Silver Bell