A Poster About Prime Numbers We're going to design a poster about prime numbers, which will appear in a mathematics magazine for middle school students. 
The poster should be both visually attractive and mathematically rich.
Do you have any suggestion for the content or idea of the poster?
Thanks.
Update: Finally! Thanks to the ideas offered here, a poster (based on the sieve of Eratosthenes) was designed and printed as the cover of our magazine. The numbers below the sieve are $4, 6, 8, 9, 10, 12$. The numbers inside the sieve are $ 2, 3, 5, 7, 11$. The number above the sieve is $1$.



Gaussian primes from http://mathworld.wolfram.com/GaussianPrime.html.
Toss [that]/[something similar], in, maybe in the corner of the poster or somewhere subtle, just for fun.
I like Gaussian Primes personally.
