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*cough*expresscard*cough*snip
Like the XG? or the Magma Expressbox.You'd still need some kinda adaptor tho to get a x1 slot presentation outside the laptop to connect the gpu to... unless you want to vandalise the laptop or hardwire the gpu to the slot hah.
The XG was meant to be shipped with a 16x 7900gs, and 1x uses more power than expresscards do, so an external adapter would be needed.the XG included a GPU and appropriate power setup... I doubt that most of the off the shelf x1 GPUs could be powered well enough off the bus power from a laptop to work reliably.