How to locate an Iphone if it is lost and offline?

I have lost my iphone 4 in my house (I know it's in there cos the day I lost it I didn't leave the house once) but can't for the life of me find it. I looked on Icloud and that was pretty useless. It had to be on the internet to be found. Is there any other way of locating it?

Have you tried.

sofa
bed

clothes pocket

Call it.