Cowboy boot craft - the link no longer works but you could just cut out a boot from brown construction paper and then glue on sequins and other fun crafts bits.
Wild West Cowboys Birthday Party Ideas | Photo 4 of 28 | Catch My Party
Western Garland, Cowboy Party Decoration, Western theme party, Cowboy banner, Western Party, Cowgirl birthday, Farm Birthday Barn Bash by Craftytude on Etsy https://www.etsy.com/listing/226555965/western-garland-cowboy-party-decoration
Pinata Favor Bags - for a fun fiesta
cowboy birthday party decoration ideas - Google Search