Heehee, I love to draw roses so they're in a lot of my designs
This site might help you with motives:
[link] I use this site a lot as a reference when I'm choosing the elements in my art. It a list of the meanings behind tons of heraldic symbols from anchors to wyverns, and also some meanings behind certain colors too.
The downside is that it's not searchable, but you might find it worthwhile to spend some free time browsing through the list.
Thanks again!