Creating mockups for your t shirts designs can take you a long time if you try to designit yourself from scratch. You can find online instant mockup generator to save you hours of work and gives you a huge variety of products (t-shirts, hoodies, tank tops, hats, smartphones etc) to choose from and apply your cliparts on them in seconds.
Placeit.com is one of the leading online mockup generator and from our experience it is proven itself to save time, on creating and editing mockups, and money since you get unlimited downloads in your subscription.
Here are some examples for cool mockups for your t-shirts with the Blue Penguin Graphics® logo on it for demonstration:
There are many more mockups to choose from at Placeit.com
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