If you have friends (looks like I’m out of this one already!) then you can now send Spore related E-Cards to them thanks to Mash On.

It’s simple to use.  Create a custom E-Card via picking a background, some characters and write your text.

My only disappointment?  You can’t add your own creatures (I’m not 100% positive on this, but from I played with, I don’t see the option).