These aren't the only things out there of course, but it should get you started and keep your drawing busy. Available in smaller, more digestible chunks at www.htdhorses.com :
Tack locker for each horse
Very beautiful photo
@Stacey: we should totally do this to Annie's mane next show! :D
Split Riding Reins by KnotsByK on Etsy Order an oil painting of your pet now at www.petsinportrait.com
Doesn't look to comfy, and the horn isn't strong enough to hold a cow or calf very well, but nice looking saddle!
Who else wants a speaker for your saddle? http://hoofbeatzaudio.com/
TURQUOISE CROSS BLING WESTERN HORSE LEATHER HEADSTALL BRIDLE BREASTCOLLAR TACK #MRSADDLE
Teal Black Crystal Cordura Western Horse Saddle Tack 14 16
This quick reference photo indicates the proper placement of Western tack on a horse. This is so good to know!