You could dig through the mounds of music that's been attributed to Bach or Vivaldi for strings and probably find something appropriate for your skill level. There's a lot of "real" music out there that is pretty easy for beginners while actually being real pieces rather than just drills, Vivaldi in particular wrote some easy music for strings because he taught his students starting in childhood from beginning all the way to expertise.
History digression. A lot of music from the Baroque period is deceptively easy to play, music from that period does not emphasize technical skill nearly to the degree of Classical and Romantic period music. If you look closely at some of the famous pieces like Toccata and Fugue in D minor you'll find that the structure of the pieces is actually quite simple, the Baroque style is defined by a simple motif that has been heavily embellished, and this is a good thing because you can just drop the embellishments when they add unnecessary difficulty. Toccata and Fugue is a difficult piece to play, but it can be made quite easy by simplifying the extra voices, for instance by reducing the counterpoint to a chord progression or broken chords or simply reducing the number of contrapunctal voices.
The reason for this is practical, musical schools did not yet exist in the Baroque period and formal education existed only in the form of personal tutelage which was available only to the nobility and the very wealthy, so pieces were designed had to be designed to be playable by someone who may not have had much formal training. This led to variation becoming a rather common composition technique.
Okay, I'm done. There exist interpretations of varying difficulty of Toccata and Fugue for violin, if you want Baroque period music I can't think of a better piece to recommend. I'd also suggest looking into some of the chamber music composers like Schein or Telemann, chamber music being essentially the garage band music of the 17th century and reasonably approachable.
When I was in the historical music group in college we played some Baroque pieces. The only ones I can remember off the top of my head is the Battle Pavane and the Battle Galliard, they're both playable on strings.
Avoid Baroque religious music, it will bore the pants right off you (this was intentional, it was seen as very improper for sacred music to be fast-paced or exciting, or otherwise any sort of fun).
Completely unrelated to the Baroque period, but if you're looking for pieces with a historical influence then I'd recommend The Prologue to Final Fantasy which is in a very late Classical/Romantic period style. I spent a lot of time mastering that when I was learning violin.
