Here is my mug, I really like it!
I think there are 2 ways to improve the situation with "throw-away" culture.
1. People should see that their friends drink coffee (or want ever they want) from travel mugs instead of disposable cups. I hope that people would follow the good example.
2. Everyone should find their perfect mug. When you find the mug that you want to drink from, you will always take it with you.