I've always had thin, sparse and light eyebrows, and filling them in on the daily is tiresome, so I tinted them at home with beard dye and the results are awesome. :
Brow Code Brow Tint Kit | MECCA
Everything You Need to Know About Eyebrow Tinting
Hi Brow Professional Tinting Kit - Light Brown | FEELUNIQUE
Insta Brows Tinting Kit, Light - Medium Brown | Waxing & Tinting | Sally Beauty