A few ideas with personality that help set a modern tone from the moment you hit the threshold:
Stainless steel and rubber, TopDeq, $125-$210, or Chiasso, $48, or UnicaHome, $134-245
footprint doormat, Chiasso, $18"welcome in" binary doormat, Thinkgeek, $40barcode doormat, Chiasso, $28
river rock pebble mat, Acacia, $45
or DIY with the help of the local big box home center, $4+
recycled flip-flop doormat, UncommonGoods, $20 or at Re:modern in varying sizes, $22-$77
For more ideas of what folks are picking for their front entry, check out the doormats wist.