If you describe someone or their ideas as imaginative, you are praising them because they are easily able to think of or create new or exciting things.
1. (used of persons or artifacts) marked by independence and creativity in thought or action;
"an imaginative use of material""the invention of the knitting frame by another ingenious English clergyman"- Lewis Mumford"an ingenious device""had an inventive turn of mind""inventive ceramics"