What you do when a new idea for a website is in mind? Look for a design that will fit for it. Here you have a list of wordpress themes shop and marketplaces, that I recommend and use.
ThemeForest
The biggest wordpress marketplace over the whole web. More than 2000 templates, good pricing.
Everyday new themes, good support.
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I like WPZOOM because of the very clean code and easy customization, also for professional support & documentation, flexible & SEO optimized code, advanced theme options panel. Also as a bonus you get one theme free to your purchase.
Theme Fuse
ThemeFuse creates stunning Premium WordPress Themes and WordPress templates for anyone that wants their website to stand out from the crowd.
Mojo Themes
Similar to ThemeForest, but with better pricing, also good customer support and over 300+ themes.
Theme Furnace
Quite new, but with ass kicking theme designs and awesome pricing (developer club rocks).
It is exactly like they write
Themefurnace provides exceptionally high quality WordPress themes for your business & personal sites.
Our rock-solid support which comes with every theme is there for you every step of the way so you can get your brand new look live in no time at all...
Color Labs
Get high-quality, good-looking WordPress themes at amazing prices. First-class customer support will help you get started on your website and bring you up to speed.
Thanks for this themes, I love some of them (tudineroefectivo.com for example use a Karma theme by Themeofest)