Anyone have any suggestions for a spacey themed treasure? I've got a few things but i want to make it pretty. ^^

Here's some! There are definitely more than this, I'm just still waking up. :P

some of these, maybe?

If you are interested in spacey balloons, I have a category for them in my gallery :D https://subeta.net/user_shops.php/shop/3289/category/Celestial+Balloons

Some more colorful/cartoony ones:

Primarily singular stars and potential planetary bodies since the most of the gorgeous "starry night" type items have already been mentioned.

[edit] A few more items that might be applicable, depending on the aesthetic that you are going for:

Ah this is perfect! thanks guys! :3