Once I had been running my vinyl business for a while and I saw what other people could do I realized how great I had it! Before I even bought my machine I was a graphic designer! Having that skill and knowing how to use Photoshop I have been able to design all my own products.
As great as that has been, it can be so time consuming! There are some great sites that sell designs specifically for vinyl! I love these sites and use them when I don't feel like designing!
Here are some of my favorites:
My Digital Design Store!
My Vinyl Designer
Peppermint Creative
Ready 2 Cut
Vinyl Ready Designs