Annaquilts

I also like green with purple. Maybe a chartreuse green?
http://www.houzz.com/ideabooks/45335...ith-chartreuse

DOTTYMO

Lime green.

Jane Quilter

take a stack of your purples and whites to the fabric shop and audition different color solids until you find what works for you

Edie

Red is the traditional. People who know quilting know that the center of the Log Cabin is red and should be just that. It matches any color because of the meaning of the red square. Every sampler quilt that I make I have the center block as the Log Cabin and the center of the Log Cabin, regardless of the main color of the quilt, is always red. It goes way back and the meaning was the welcome to the home with the fire in the fireplace. You change the color and it isn't a Log Cabin anymore. Edie

ManiacQuilter2

I agree. What an interesting question to ask. I would suggest to look at a Color wheel
Complimentary of purple is yellow
Analogous would be a blue purple or a red purple

I might go wild and try red for the center.

Have fun. Have you asked Hot Rod??

twinkie

If it were me (and purple is my favorite color), I would use a deep purple or a purple/teal batik.

cannyquilter

How about grey?

zozee

Yellow would be my first choice to try. It pops as the complement to purple.

Lime green looks happy and youthful.

Grey--sophisticated

Tangerine---modern

Turquoise--soothing

Red--traditional

I guess it's a mood thing. I'm sure you'll know it when you see it.

Texas_Sue

After looking at some purple log cabin quilts on Pinterest - a really dark purple, green or red is very striking.

WMUTeach

the first thing that came to mind for me was black. It would certainly depend on the actual fabrics you are planning to use. A deep purple as the center or I like you thoughts of yellow. It would "jump out" at the viewer.