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If you like when I get home I will put together vector version.

Grace,
Here are some of my color experiments. They are down and dirty so just view with a grain of salt. The two largest are similar to what you have except for the check mark.
I have not yet...

I totally agree with Gare about the blue. Another thing I noticed that bothers me is the dark brown background on the Xart logo, it is too close in value to the blue check mark and the check mark...

I dunno, personally I like the green and the dark red one. They all seem strong to me. The Xart logo looks especially good. the two parts read as an X yet are separate. I do not get a feeling of that...

Barbara that is a very good design. I hope Gracehjs can figure out how to implement it.