I recommend a Pebble smartwatch or Pebble Steel. I have one and it's awesome. The original comes in many colors, and the Steel comes in two, but the general consensus of /r/Pebble is that the Brushed Stainless Pebble Steel is better than the Black Matte version.
P.S. If you are not OP and you are just looking for something to buy, check out getpebble.com. For some reason on Amazon all the colors cost different amounts, but they are all the same cost on the official website.
Or here's a direct link for you:
Pebble Smartwatch for iPhone and Android (Black) by Pebble Technology Corp http://www.amazon.com/dp/B00BKEQBI0/ref=cm_sw_r_udp_awd_dGiVub1H4EXFJ
Running $99 these days...
Does he wear watches? As a designer who does not wear watches a watch, that only acts as a watch, would be pretty useless. That said, if hes does wear watches, is he really into technology? Something like this may be cool: http://www.amazon.com/Pebble-Smartwatch-iPhone-Android-Black/dp/B00BKEQBI0
Watches aside, if he is a web designer then he is likely into technology. Any cool little technology can be a fun gift. It all really depends on what he is into, you'll find graphic designers who are into all kinds of different things so it is hard to say one or the other.
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Edit: $99.99