I forgot to blog about this when we released it, but I have some more of those handy little development tools that we’re releasing for Metaplace available here for you. There’s a particle editor that spits out sprites so you can bring them into 2d worlds easily, and there’s an animation strip editor that helps you make sprite sheets. Both of them are only available for Windows right now — sorry! — but they’re fun to mess with and might be useful to you even outside of a Metaplace context. You can grab them here. They’re basically unsupported, since I do them mostly in my free time.
Some screenshots are below. There’s full docs in the tools.