You can actually find little stainless steel trays around scrapyards, tip shops etc just need to keep your eyes open. Then either make a perforated tray with a piece of perspex or aluminium plate (also easily found in the above places) by drilling a pattern of holes. Both these materials are very easy to work with and will give you a nice professional finish with little hands on work/skill. Also, don't rule out the possibility of a brass drip tray of sorts, these look great polished up.
I've also seen one that was made using a vent cover which had a nice ornate pattern on it. Looked superb. So consider getting creative and make something unique. Good luck with it.
Some espresso machine retailers and repairers sell new and used drip trays for their machines that are cheaper than in the beer industry. They are often stainless steel, as well as plastic. Those for the larger commercial machines would be perfect for homebrewing.