Grunge design is gaining popularity among designers, this is becoming a trend in web designing and so in wordpress themes. At the moment there are not many free wordpress themes in grungy style, but with the popularity of the design we may see more in the near future. Grunge designs usually contains dirty, rugged, irregular, nasty, torn visual elements to give it a different and unique look.
PassWord: Password is a three-column wordpress theme with grunge visual elements and a wooden background. Theme comes with built in support for Flickr, Pagenavi plugin, related posts and recent comments, (no plugin installation required for these features). Preview & Download
WordPress Fun: This is a theme from Smashing Magazine, the theme has a fresh look with a caricature. Only works with wordpress 2.5.1 and above. Preview & Download
Modern Oak: This is a two-column wordpress theme, the theme page is in english, but there is a English package for download. Preview (Image 200KB) & Download
Grunge Superstar: This is a one column monochrome wordpress theme. Preview & Download
Our Rights: Our Rights is a Grunge style two-column wordpress theme released under GPL. Tested with WordPress 2.5, supports widgets. Tested in major web browsers including IE6. Preview & Download
Scruffy: Scruffy is a two-column wordpress theme with a grunge style elements. Preview & Download
The Grunge: The Grunge is a fixed width two-column wordpress theme. Supports widgets, advertising blocks. Preview & Download
Duffy: Duffy is a three-column wordpress theme. Preview & Download
Blue Jeans: This theme is available in both two-column and three-column style. Preview & Download
Aspire: Aspire is a three-column wordpress theme. Preview & Download
Tropical Grunge: This is a two-column wordpress theme. Preview & Download
Also check out related posts on WordPress Themes:

wow, They look so different . Stumbled.
@Madhur
That was quick, thanx for the stumble
I really like the adaptation of wood grains lately. Very cool! Some very nice work coming out of the ‘grunge’ style.
Hey,
A very unique list. Stumbled!
Beautiful themes. Stumbled
@Shankar, Nirmal
Thanks for the stumble
Good collection of themes. WordPress Fun theme looks nice. Stumbled.
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Thanks for featuring one of our themes (TheGrunge) – Much appreciated!
- Jon – PositiveNoize
It’s nice! Thank’s
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Beautiful themes. Stumbled
It’s really special, thank you very much.
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woow.. nice and cool theme, i like this,, thanks for the share