How to Get This Effect?

[yiddojonny]

I came across these photos on flickr and love how they look. Its the high contrast colours that are striking. Does anyone know how he gets this effect? Thanks in advance.

 

[walls]

cross processing...google it for more fun

 

[yiddojonny]

Thanks for the quick reply. Will check it out now!

 

[TheBigYin]

one of these, and some of this... and a freindly lab to process it for you

 

[Tyke Tiler]

Looks like a lot of contrast adjustment and duotone/split toning.