Plaid: a warm and cool theme based on a plaid pattern.
Chessboard: a simple black & white design for intellectual bloggers.
Nightmare: the title says it all; the painting is by Henry Fuseli, 'The Nightmare' circa 1781. 
Olive & Wine: this theme uses the color scheme of the Nightmare theme, but has no header. For those who like the colors but don't want such a big header at top.
Rock Garden: lots of nice gray with brown and navy link colors to offset this theme based on natural stone colors.
Library: perfect for book reviews, in orange golds, browns, and old book page yellows.
Dark Faerie: Best to be used for those who like Victorian romances and ghost stories, too.  The color scheme is gold, orange red, brown -- the colors of an old painting with an ornate bronze frame with a slight other worldly green highlight.  The plug-in titles should be short and sweet, as you will notice that the labels only allow for so much room.
Flora & Fauna: simple animal and floral theme with clean white, toasty brown red, cool teal, and grass green colors.
Incense: a theme with cool lavender and lilac tones subdued by creamy smoke beige.
Wild Floral:  blog theme with just footer, no header -- like a box of flowers planted under your words. 
Swirls: simple, clean scrolls and swirls
Lotus: I originally had the lotus sitting on the bottom of the blog as a footer, but I think it looks much better as a header.
Choco Dots: Milk Chocolate, mint green, and frosting pinks make this theme almost good enough to eat.
Lucky Charms: looks just like an old baby blanket for those bloggers who want something pastel soft and sweet.

Submitted earlier:

Squid: This lil' buddy swims in deep, dark waters. Created at the request of nubeat 

Rose Journal: a sweet, simple theme for love letters. Easily customizable for those who want something delicate.
Rose Thorns: Is a very sexy and romantic theme utilizing a new CSS trick I learned; it has a footer as well as a header image! Just like the following...
Natural: Expect more new themes like this one -- utilizing both a footer and header to create a frame. It was a real headache to figure out, but I finally got it right.

What to expect from me next:  Lighter colored themes, simple themes, themes with a retro twist, more themes without headers but have footers, and an incense theme.  Come back on Tuesday or leave a request here.

Other themes I've posted for review you may have missed:
Muskie!

Houston, Texas!
Cassette Tape
Moroccan
Chili Peppers
Summer Lovin'