Deep purple and yellow are both serious statement colors. At least bright yellow. They might compete.
For a spring wedding, a really nice sage green would be lovely with the purple. Very classy. That's the first one that came to mind.
Another possibility is to find a lighter variation of the purple and offset it that way. Some shade of gray would also be very cool, but somewhat avant garde. I'm thinking bridesmaid dresses here... Using a green of some sort with the Purple enables you to tie it in easily with your cake, centerpieces, whole bit.
But green may get a bit lost in bouquets, etc. How about 3 colors? Passionate Purple, Sage Green, Lavender. I did a variation of this for mine.
Baby pink and dusty rose. Looked awesome. Best of luck and hope this helped!
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