Hey, you didn't describe your theme idea, colors alot, just "a simple theme" layout (grid, 2 column or 1) sidebars, complex options (full control of the theme)?
Hi there! Get in touch with me I'm excellent at creating and customizing tumblr themes. Check out my graphic design and web design portfolio on here. Also, I've just begun designing my own tumblr theme at www.wickedtomboi.tumblr.com.
Looking forward to hearing from you.