Help in Verilog

Hi;
as our homework(first homework for writing a Verilog program ) we should choose 5, TTL ICs and write their verilog codes individually and then using them for describing a bigger logic circuit .Could u help me and suggest a logic circuit using 5 TTL ICs.(it shouldn't be an (and ,or) circuit).
thank in advance
mona

you can pick common gates (NAND, NOR, XOR...) from 74xxx series then combine them into simple "building blocks" such as addres, decoders, multiplexers, counters etc.