A particularly simple non-homogeneous example in which one can explicitly integrate the Jacobi equations is the complete metric on $\mathbb{R}^2$ given by
$$
g = (x^2{+}y^2{+}2)\bigl(\mathrm{d}x^2+\mathrm{d}y^2\bigr).
$$
It has Gauss curvature $K = -4/(x^2{+}y^2{+}2)^3<0$, and, visibly, a rotational symmetry about the origin $(x,y)=(0,0)$.

It is not hard to show that, up to a rotation, each geodesic can be parametrized in the form
$$
(x,y) = \bigl(r\,\cosh t,\ \sqrt{r^2+2}\,\sinh t\,\bigr)
$$
where the constant $r\ge0$ determines the closest approach of the geodesic to the origin.  The element of arc length along this geodesic is then found to be $\mathrm{d}s$, where 
$$
s = t + (r^2{+}1)\,\cosh t\,\sinh t.
$$

Now, the Jacobi fields split into the tangential Jacobi fields, which are spanned by
$$
J_1 = \frac{\partial}{\partial s}
=\frac{1}{(1+(r^2{+}1)\cosh 2t)}\,\frac{\partial}{\partial t}
\quad\text{and}\quad
J_2 = s\,\frac{\partial}{\partial s},
$$
and the normal Jacobi fields $J_3= f_1\,N$ and $J_4 = f_2\,N$, where $N$ is the unit normal vector field to the curve and $f_1$ and $f_2$ are a basis for the solutions to the (linear) normal Jacobi equation
$$
\frac{d}{ds}\left(\frac{df}{ds}\right) + K\,f = 0.
$$
Using the above formuale, one finds that these can be taken to be
$$
f_1(t) = r^2+1+\cosh 2t\quad\text{and}\quad 
f_2(t) = \sinh 2t\,.
$$

Finally, note that these formulae generalize immediately to the case of the cohomogeneity-1 metric on $\mathbb{R}^n$ with the formula
$$
g  = \bigl(|x|^2+2\bigr)\,(\mathrm{d}x\cdot\mathrm{d}x),
$$
since every geodesic in this space lies in a 2-plane through the origin $x=0$.