Do you have a hatch or sedan?

Instead of just changing the bulbs I would suggest new faces...

For the 1st gen aveo---http://cgi.ebay.com/ebaymotors/CHEVY-AVEO-SPEEDOMETER-GAUGE-FACE-_W0QQcmdZViewItemQQhashZitem414274bae1QQitemZ28028 7820513QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries

On the 2nd gen aveo, someone had a company make some custom gauge faces as well.

If you want to keep the stock faces through, you will have to remove the faces anyways and take of the green film. Even if you put blue bulbs in, they will still be green unless the film/tint is removed. Since you have to take the cluster out and take everything apart, I would really just grab new faces if you have the funds.

There are a ton of threads, I have to see what they call that bulb again, I did mine two years ago or so.