Free as a bird

Green as grass

 

Hard as nails

ice (as cold as)

Jolly (or happy) as a sandboy.

Knowledge is the route of all evil

 

Large as life.

Money makes the world go round

 

Nice as pie.

Once is enough

Pretty as a picture.

Queer as folk

Right as rain.

slimey as a snake (which we know isn't slimy at all)

 

Thin as a rake.

stuck with a 'u'

 

unlikely bed fellows - can't think of anything else

 

Vain as Simon Cowell (all I can think of)

Wet as water

 

I like the Simon Cowell one

These last ones are hard.

 

Xtra special as Darius!

Young as a new born babe