Green is one my favourite colours... I typed in 'green' for the fun of things, and saw this cute little beetle!
In Australia, the country I live in, there is a similar bug known as a Christmas Beetle (because they're mostly found around Christmas time- during the summer). However, it is yellowy overall with a purply-greeny lustre. There are green varieties, too. Here are links to a photo of each if it interests you: