The problems with running HDMI cables in-wall is that the in-wall cables tend to be thicker and harder to work with, some equipment can have range limits shorter than what you require and overall it can get a little expensive.  The simple solution is to transmit your HDMI signals over CAT5 or Cat6 cables. 
Monoprice delivers you an HDMI over CAT5/6 cable solution in a neat and tidy wall plate configuration.  These compact wall plate units utilize a pair of CAT5/6 cables and deliver pure, rich high definition audio and video.  Installation couldn't be simpler. 

Specifications:

• Bandwidth:  165Mhz
• Support: HDMI 1.3, DVI 1.0, HDCP 1.1
• Video Format Supported:  1080p/1080i/720p/720i/480p/576i/480i
• Transmission Distance:  (results can vary from one set up to another)
• Solid Cat6 STP 23AWG  -  28m @ 1080p
• Solid Cat6 UTP 23AWG  -  27m @ 1080p
• Solid Cat5e STP 23AWG  -  21m @ 1080p
• Solid Cat5e UTP 23AWG  -  21m @ 1080p
• Size:  114.5mm x 70mm x 29.5mm
• Weight:  0.200Kg
• Power Consumption:  10W (max)
• Operating Temperature:  0 to 70 degrees Celsius.
• Operating Humidity:  10% to 85% RH
• Storage Temperature:  0 to 80 degrees Celsius.
• Storage Humidity:  5% to 95% RH
• FCC and CE Approved