Be careful cutting/pasting from someone else's work. If the lashes are recognized you will be confronted. Now if you make your own set (by hand not copying) and they look similar, that is fine. Just no blatant using of someone elses work.
There is no easy way to create custom lashes. You will have to break down and create them by hand, whether it be with a tablet or photoshop brushes.
Most the fun is finding your own style