that's good, but i have a k810 to and want to put some new menus...how did you do it?
In case you still dont know i will describe it here in few very simple steps:

1.download set of icons you want and make sure there is menu.ml file included(in most cases its allready included with pack of icons),extract it and put in some file where you will later find it

2.turn of your phone and connect it via xs++(i assume you allready have this software and are familiar with it)

3.when phone is connected in configuration panel in xs++ (one at a side with status bar)
select PSX option and wait until xs++ examine your phone and prepare file tree.

4. go here tpa/preset/system/menu and delete allready existing menu.ml file. and simply with drag and drop pull your extracted icon set in place where you delete menu.ml(tpa/preset/system/menu),make sure menu.ml for your new iconset is included.

5.just click finish button and thats it :)

Hope i made this steps understandable for you.
If not drop me a line and i will put some screens.

I wish you the best

Sin