Assistance - Pictures instead of icons

[Roving-Ronin]

In the examples it mentions using pictures instead of icons and shows an example with wheelie bins:

or like this (needing Red, Green and Yellow tops):

Are these wheelie bin type pictures available to download? If so, from where ?

Thanks in Advance.

[theitghost]

If i want use a big picture, they have all only a small Icon format. Can not change the size.