Howdy partner! This quinceanera theme is all about getting country and adding a little fanciness to it. In Mexican culture there is a heavy western influence and some people are really into the rodeo and vaquero lifestyle. If this is you, there is most certainly a way to use that in your quinceanera.
My idea for this theme is aqua blue with browns, silver and gold. Cowboy/girl boots are sometimes adorned with floral embroidery and that's something can be incorporated in dresses and such. Paisley print is another design used for country western so that's good to use too.
Get everyone to wear their boots and hats and definitely don't exclude yourself. Also for decor use straw and burlap mixed with the usual satins and other party materials. Try to find a barn that's available for events and use it, it's the perfect place for this.
Photo sources from left to right: Turquoise Western Boots Invitation | Cowboy/girl Cupcakes | Mason jar decor | Fancy Paisley Cake | DIY Mason Jar Centerpieces: Floating Candles | Aqua and gold western cake idea | Light blue and white party decor kit | Rhinestone Tiara Cowgirl Hat | Quinceanera Filigree Gold Ring | Candy Buffet Table | Burlap and aqua blue bows | Aqua blue hair comb | Resin Horse Head Wall Hook | Use a barn for the venue! | Aqua and Silver Floral Quinceanera Invitation