Hydrangeas will usually turn some shade of pink when the blooms mature. These shades of pink differ so it may be worth your while to see them in person around this time of the year so you can gauge if the shade of pink looks well or not.

Here is a picture:

http://www.waysidegardens.com/product.aspx?p=v1841&utm_source=msn&utm_medium=cpc&utm_campaign=IDS_Perennials&utm_content=IDS_Perennials_Hydrangea_v1841&utm_term=Bobo™%20Hydrangea&CAPCID=5461664777&CADEVICE=c&utm_source=bing&utm_medium=cpc&utm_campaign=IDS_Perennials&utm_term=%2BBobo%20%2BHydrangea&CA_6C15C=120019360000123546

https://www.provenwinners.com/plants/hydrangea/bobo-hardy-hydrangea-hydrangea-paniculata

You could deadhead the blooms if you do not like the shade the pink but like the shrub at other times. Kind of like some people do with roses.

All of the H. paniculata start lime, turn white, and end with some shade of pink ranging from a reddish pink to a lightly pink buff color. How long the various selections spend in each part of the color phase varies. I think some of the pink shades could look fine with brick. There are several folks who grow Bobo who regularly post on the perennials forum, so you could ask there if they have photos and when they take on the pinkish tinge so you can judge if they would work for you. Here is a thread with a pink phase photo.

Do you need a plant that small or would 4'-5' work? There are some varieties of H. paniculata in that size range that spend less time in the more pink shades, such as 'White Diamond', which from what I read spends more time in the white phase than most others (I own one, but it's new this season.) Check out Little Lime and Little Lamb as well in the 4'-5' range. If nothing else works, you can get a variety that stays white longer and then cut off the hydrangea blossoms when they get too pink. This is a really long blooming shrub, so even if you prune off the pink phase, the pale green and white time period of bloom will add up to several weeks.

If you add where you are, we will have an easier time judging whether colors and blooms times will be similar in your garden to other posters' experience. Here's how to add it to your profile so it posts automatically next to your name:

Go to Your Houzz in upper right of every page, click Edit Profile, and on the left side click advanced settings. Well down the advanced settings page is a blank labeled Climate Zone for Garden Forums along with a link to find your zone.

If you add info on your state or the nearest large city you will get even better information since zone only relates to average coldest winter temperatures.

Then return to the top of the page and click Done Editing.

Thanks, I live in south eastern Ontario Canada in Kingston, on the shores of Lake Ontario

Rouge21 who started the thread I linked above is also in Ontario, so his experience as to when it starts shifting color may be useful. Woodyoak also is in Ontario and has hydrangeas, but I don't remember if she has Bobo or not.

Check out Silver Dollar, Sweet Summer, Little Quickfire, LIttle Lime, Strawberry Sundae, Pearls N'Pink, Wedding Gown, Magical Flame, etc. Just look at the plant labels to see what the shrub's estimated size at maturity is in order to find paniculatas that are compact. Observe their pink color and see how that looks against the brick and decide if you want it or if you want it but will deadhead the bloom when it starts to clash with the brick.