I've been designing graphics for years, but just recently thought to sell them on ebay. After years of knowing some HTML but not enough to be a good page builder, I've been studying HMTL like a madwoman so I will hopefully be offering templates soon.
If you want to do an entire store appearance, I'd recommend KWK or someone else who can offer the entire package. KWK's website is www.kwkdesigns.com SilverGypsy is also good...www.silvergypsydesigns.com also does a very nice job!
Customizing your store's landing page to a completely custom look requires a lot more HTML know-how than, say, picking a logo and template and matching your store color scheme to those.