Hi! I have a gorgeous Betty in cream color. I have used it several times with no problems. I am careful with my bags, I always watch where I set them down to make sure they will be okay. But, I think you will be fine with a light colored one.
I have a tan Betty (I'm trying to remember the actual color name and can't) and it has held up really well over the years. The straps have darkened slightly I think with wear, but other than that, I haven't noticed anything.
It is a great bag, I have 3! (The tan, a black Betty, and a lovely chocolate patent chain strap Betty.)
How do you ladies feel about carrying the lighter colors in fall/winter? I noticed even mass-retailers like Banana Republic are selling white "Chalk" bags for the fall, and a slightly deeper version as well.