I have the sunshine kids (what Diono was previously) in a gray/ black pattern and its nice. The materal is kind of silky and easy to wipe down. I went with neutral thinking it would be better should I ever have a boy but now I'm thinking ill likely buy a new convertible for the next one since they are in them so long, DD will probably still be using it.
DD doesn't really seem to care too much about her seat, but I have a feeling she'd get excited over a girly pattern:)
ETA: I just checked the patterns. The one I have is shadow. I'm not crazy about the spring flowers so I'd probably buy either plum or whatever matched my car. When I purchased mine they had a really cute pink floral pattern but I guess it was discontinued.