Basecamp started without an automated payment system.
Product Hunt started as an email list.
Whatever you are thinking about pursuing or creating, start small, start humble, and do the hard work first.
Don't try to design an amazing crime-fighting costume, fret over the material or the logo on the chestplate, before you start fighting actual crime. Grab your sweats and mask and start looking for injustice!
Otherwise, you may find out after 6-12 months of design (guilty!) that you actually don't care for crimefighting afterall.
The best projects I've created or have been a part of have started small - designed, developed, and later refined through a beautiful mix of code and design together.