Worldbuilding

If you can't make them interesting enough physically, give them quirks in their language and actions that seem alien to man, and in kind, make mankind seem strange to them. Do they end every statement with a strange sound? Do they not sleep? Do they communicate silently telepathically or by touch? What do they find valuable that an ordinary man may find worthless? What would they do if they found gold, precious stones, or complex machinery? Description alone should not instill a sense of culture, only their actions can.