The TI wiki has had a "CosmCloudApp" page for some time, but recently it's been deleted. The link here is to a previous revison of that page. Since there are quite a few public feeds when you search for "CC3000" it may be the case that TI have shipped this example at one point, but I was unable to find the source code or binary on TI website and according to the TI E2E forum it's nowhere to be found for quite a while.
After having a quick look at the SimpleLink API Reference Manual (download zip), I can see that it provides BSD-style socket API. Therefore it should be relatively easy to port Xively C library to CC3000 API using provided POSIX communiction layer.