So that other newbies might benefit I thought I would post the results here.
These are all Effetre transparent glasses on CIM peace (white). Please bear in mind that colours may view differently on different monitors.
As you can see, some colours show up really well and others are just a waste of time.
If you layer a white dot first, say on clear and then a dot of one of the above transparent efftre glasses you can see what the colour will look like.