Olympic Games- Stamp Designs

Below are some variations of my initial stamp design ideas. 

The idea of having a series of 6 stamps within one little stamp book, 5 of the individual circles of london and then a larger one of the 5 circles lined together. 

Here I decided to use gold for the queens head, the London Olympics logo and the definition of what each circle represents. 

I still kept with the white background but changed the colour of the queen, logo and definition to correspond with the iconic colour of each Olympic circle.

Here i reversed the colours, seeing if it looked better adding a bit more dimension to the stamp. I think these work for other class stamps, but possibly for the 1st class set i should stick with the cold and 2nd class maybe try silver.

I still feel i should try different scales and layouts, so back to the drawing board for me, playing around with the scale and layouts, to see if anything works better.