|The Dance, Henri Matisse, 1910
If you're interested in using Matisse, it's worth a check on the internet to see what is being said about Matisse, as it seems that this is one of those names that gets some quite different and passionate reactions. On one hand, one mother who names her daughter Matisse said that she receives nothing but compliments on her daughters name. But on yahoo answers, the responses to one woman's query about what people thought of the name were overwhelmingly negative - the favourite response chosen by voters was "I think it's really pretentious...it's like the parents are insecure nouveaux riches trying to shout to the world, "We are classy people who know about art!!!!! We appreciate art so much that we named our daughter MATISSE!" She went on to say "I don't think it makes any sense as a first name for a girl, either, since it's the surname of a male artist (Henri Matisse)" and "It also sounds like Maltese (those little white fluffy dogs). Just bad, bad, bad all around". I was more than a little shocked, as I doubt that anyone would actually say this to a child (or their parent) who bore this name!
I personally really like Matisse. And even though I like art, I wouldn't neccessarily choose it for it's "art factor" alone as there are other artists that I much prefer ;-). I think of it more as a girls name, probably because names ending in '-isse' or '-issa' tend to be girls names. If you wanted to differentiate it a little for your girl, maybe try the more feminine Matissa. Then it also lends itself to cute nicknames Mattie or Tissa.
If you have no problems with the nay-sayers who think it is a little pretentious (but would only say so behind your back, most likely) then this could be just the unique but not unheard of - or made up - name that you have been looking for. I can't see this hitting the top 10 or even top 100 any time soon, so you can be sure that this is one your child will not share with 5 other children in their classroom.