Ian:
Cryptocurrency stickers: I wouldn't think so; what is their purpose?
Cryptourrency t-shirts: Again, those who want such shirts are already wearing them (or they're in bags after forgotten tech shows).
Desgin Services accepting crypto currencies: Possibly, but moreso when cryptos are more widely held.
Technical Services Accepting crypto currencies: I'd like to think so, but have had no experience with people approaching my (niche) technical services business that has accepted cryptos as payment since ~2011.
Best wishes to your friend and his new venture. Hope I'm wrong and that there are Australians with cryptos ready to pay for digital and technical services right now.