I have already asked this question on crypto.stackexchange but I think here is the appropraite site for this.
Is there a pratical application to PRNG that generates a sequence which is not a binary one? A ternary, quaternary sequence, for instance. If so, how can we test this? Is there any alternative test suite, like NIST test suite in order to test the randomness for non-binary sequences? For example, what if I generate a sequence in modulo 255 and then use it to encrypt an image in one-time pad manner via adding the values of pixels by the generated sequence in modulo 255 ?