As said above, insurance companies need to know every mod. Whilst many will not increase your risk directly, they give an insight into mindset, which affects risk.
Alloy wheels, even ones that might have been optional when new, can increase the premium.
Winter or all-season tyres generally do not affect premium.
I binned my front foglamps, after one got a hole in it, and replaced with daytime running lights. Insurance company noted, were happy, no premium increase, but in the event of a collision, they would put back to stock, despite costing twice the amount. Daft.
For many years, there was a Peugeot 106 in Swindon that appeared to have very distinctive, and good looking alloy wheels. Once close to, they were home-made trims. I thought they were brilliant. Depends on practical skill levels, and design skills.