Sure!
Assuming you already have a DECT phone ........
1. First you need a usb adaptor, I got mine from Ebay for £25.00 including post and packaging (I just searched for Skype products an searched through to find one at a good buy it now price) it was with me in about 36 hours.
2. You also need (I know that some adaptors come with these, some don't) another small adaptor that basically converts a UK phone lead to a US one.
3. All you do then is connect the adaptor to a free usb port
4. Plug your phone into the box (using the US to UK adaptor)
5. If you want to you can also plug your landline into the box as well at this stage
6. Install a small programme on your pc, the one I have is called CallMe, it configures the connection to your phone, allows you to change the volume etc.
7. Set Skype to ring and receive calls from a USB device
That's it, your phone will receive calls from both the USB (Skype or other VoiP provider) and from your landline, you can set them to have different ringing tones so that you know which is calling too.
Hope this helps 8)