The key to grabbing attention is "Disruption". Signs in unexpected places or at unexpected heights. Cards in unique shapes. Strategic use of white space. Unique materials. These are all ways to 'disrupt' the norm and help people pay attention.
Here's a few tools from ChurchINK.com to help you create 'disruption':
Floor Graphics
Adhesive Window Signs
Round Cards
Counter Cards
Square Cards
Plastic Cards
