For any number field $K$, the Fontaine-Mazur conjecture predicts that any potentially semistable $p$-adic representation of the absolute Galois group $G_K$ of $K$ that is almost everywhere unramified comes from algebraic geometry (i.e., is a subquotient of the etale cohomology of some variety over $K$, up to Tate twist). As far as I can see, the only cases where any progress has been made concerns the case that $K$ is totally real or CM.

This made me wonder: Is the Fontaine-Mazur conjecture known to be true for $1$-dimensional representations for any number field $K$? For CM fields, the theory of CM abelian varieties gives varieties whose cohomology realizes nontrivial characters (and I guess that easy variations should produce all characters). What are the geometric objects appearing for other fields?

[edit: The word 'geometric' is avoided now, see the comments.]

defineda $p$-adic representaion of $G_K$ to be geometric if it is almost everywhere unramified and potentially semistable (at every place $\mathfrak{p}|p$ of $K$), and conjectured that every geometric representation is ... $\endgroup$ – Chandan Singh Dalawat Jul 25 '10 at 13:25