Some Potential Crossovers I Might Do...

A Trip to the Haunted Mansion (Comedy/Crossover) [Crossover with the Haunted Mansion at Disneyland, not the movie of the same name]
"After a mysterious mansion appears on the outskirts of the everfree, two of Equestria's most daring ponies decide to spend the night. They later discover that this was a really, really bad idea."

Lapis Philosophorum (Dark/Crossover) [Crossover with Fullmetal Alchemist]
"All power has a source. Every mare, stallion, and beast that roams Equestria has to get their magic from somewhere. But where? It turns out that some mysteries are better left unknown."

The End and the Everfree (Human/Crossover) [Crossover with Metal Gear Solid 3]
"There's something in the Everfree Forest. It's no pony. It's no monster. It's something far, far worse. Fluttershy intends to know just what it is."

Lost in the Toybox (Adventure/Crossover) [Crossover with Paper Mario]
"When a Hearth's Warming Eve shopping trip takes a turn for the weird, three best friends find themselves stranded in a magical world of toys."

Out of these four, which ones should I work on first? Should I work on any of these at all?

Comments

[The card holder]

The one with The End seems neat, if only because of the inevitable puns you will enact while naming chapters.