I beg to differ here. Click the link to see my beautiful Erik the Red.
:PUT SOME CLOTHES ON! And watch were you put those spurs. A bearded dragon would be good choice, but they are not colorful. A yellow spinytail iguana may be good for you because they tame down nice, get a little bigger than what you asked for, but are colorful. Another good choice would be a green basilisk (basiliscus plumifrons) very cool looking.