IKEA - New styles?

How often do IKEA change their style of sofas etc. I like their current prices but really hate their colour choices. Is it every year?

I think they introduce new styles and colours in all their departments on an ongoing basis.

If it's not a leather sofa you're interested in [broken link removed]do slipcovers for most Ikea styles, including discontinued styles. I haven't used them myself but they seem to have been around for a while, so presumably they're doing something right.

I see that the loose covers being sold on the Bemz site mentioned above are actually dearer to buy than the complete suite from IKEA.