Have you ever come up with an ingenious idea for a store or website, but thought it could never happen? These 10 successful web stores and sites are proof that a good idea doesn't have to follow normal business conventions. Next time you have a wacky idea for an online boutique, give it a second thought.

Online since: 2004
This web store sells one item per day until it is sold out or until 11:59 p.m. central time. No guarantees, no back-orders, and no waiting/notification lists.

Online since: 1999
The perfect place to find a gift for geeks, this website sells everything from Darth Vader flash drives to candy and specialty office supplies.

Online since: 1999
This online marketplace sells funky, unique gifts (such as recycled-license-plate peace signs) that are environment, animal and people friendly.

Online since: 2006
This online community allows people to exchange books with one another through a point system and offers members the opportunity to buy the books through amazon.com (which is how they make their moola).

Online since: 1995
This once obscure site (started as a list of San Francisco events) is a now a humongous centralized network of online forums and classified ads. It rakes in more than 20 billion page views per month--making it the seventh most visited English-language site in the world.

Online since: 1999
This web store provides the interface for members to create, sell and buy custom T-shirts, mugs, posters, bumper stickers, etc. Users can upload their artwork and start selling their designs to other members and the general public.

Online since: 2005
This website is like the king of all flea markets. There's finally an online marketplace to buy and sell everything from popsicle-stick men and macaroni necklaces to exquisite handcrafted furniture.

Online since: 1998
This is the place to go for people who want to "green" their lives. It's a comprehensive web store for eco-friendly products, information and advice.

Online since: 2007
Shell out $10 and this web store sends customers (or gamblers, suckers, whatever shoe fits) a random item within seven business days.

Online since: 2008
This web store offers a reliable place for disgruntled ex-significant-others to sell, trade or give away jewelry. Best of all, a new sweetheart will never know where the bling came from.