Afghan, swatching, color choices

Last night and tonight I've been playing around with swatching some colors and stitches for a new afghan project. It "bugs" me that the variegated yarn is so much thinner than the solid colors of the same brand of yarn. I'll have to try holding 2 strands of it together, but think the colors might "muddle" a little more than I'd like. I tried holding a strand of soft white with the variegated, and love how it muted the colors, but it is a little too thick. I wonder if I can find this soft white in a sport weight?
So far I have daisies in cornmeal and soft white, with ripples of soft white, buff, warm brown and aspen print variegated.