it is a beautiful quilt, honestly just about any kind of border would look lovely.
but i agree with plain borders instead of any fancy ones, more to frame your design than to distract from it :D
i do think the black frames it nicely, but seems it should have at least 2. maybe a thinner 1 with one of the colors in the design :D

this is what I was talking about (forgive the horrible sketch - best I can do at work)

Maybe if you want to have a darker border, pick colors in the quilt and get darker shades of them.

Quilt you win the prize!!!!! We like it! Thanks so much...

Try a small 1 1/2 - 2" inner border as a resting place then a wider (maybe purple) border. This is a stunning quilt. Love you colors. Very energizing.

wow.. I have a LOT of great ideas now.. I am going to play with it and I will see what happens.. If you think of something else PLEASE share...Thank you all sooo much!!

Quilt - what would you put in the corners if you do your idea on the sides?? I think that makes the block look finished... I love the idea.

I did that to mostly turn your square into a rectangle so you could then put strip borders on it. The additions would just go on the top and bottom, so there aren't corners, per se.

-Wendy (Quiltilicious)

I'm so useless when these questions arise. I like what you've done so far.

I think a dark orange flange between a narrow yellow border and a black outer border would really make it pop!!

I'd suggest a white small border followed by a wider yellow. The white pops the colors while the yellow bookends it since your middle star is yellow.

No matter how you do it, it's really pretty!