Looking for a multicolour border pattern to finish off my blanket.

Hi team! I’m just about finished my sunburst granny square blanket, and I’m wondering if anyone has any suggestions for a border. Ideally, I’d like to incorporate all 5 colours without making it look tacky. But maybe that’s too big of a dream.

I’ve considered a HDC in white while carrying the other yarn colours and switching to multicoloured puff stitches or something like that but haven’t executed the process yet. That, or something similar to the second pic attached. Is this tacky? Should I stick to white?

For reference, the first pic is what half of the blanket looks like so far. It’s a blanket for me, an adult, if that makes any difference.

Maybe someone else has an idea that I haven’t thought of yet. All ideas welcome. Thanks in advance!