I can on both accounts, but I'm not very experienced. The backgrounds on all the images I have, except "[SFM] Blackjack", are modeled and put together from scratch(the clouds in the Crystal RBDash are modeled) ; and I did end up making my own pony model just for giggles, but I tired to make realistic eyes for it and it just ended up looking creepy.
And I made one animation:
youtu.be/8GbDid5MOq4