This is a simple 壁紙 but it's cute :3. It's ストッキング from Panty & ストッキング with Garterbelt. The アニメ isn't 安全, 安全です but this fanart 壁紙 is ;P The link for the much bigger version is here ----> link
Also, I'd recommend using either zerochan.net または konachan.COM (konachan.COM has 安全, 安全です Mode while konachan.NET has Explicit Mode) for looking for wallpapers. Deviantart.com is good too. konachan.com is very hard to navigate in the beginning at least because the 検索 thing is really weird.
If あなた make an account on zerochan.net あなた can also do some really cool filtering. Like okay あなた don't want anything mature right? Well, there's a thing where can add タグ of things あなた DON'T want to pop up in your 検索 so you'd put things like "Ecchi" または "Hentai" and it'll filter those out for you. あなた can also add お気に入り タグ so instead of having to type something in over and over again your お気に入り タグ appear on the homepage and あなた can just click those.
Zerochan.net combines your お気に入り タグ and your Disliked タグ when searching so あなた can 検索 for "Wallpaper" and your お気に入り タグ will come up most often and no Ecchi/mature content will ever come up since those タグ are disliked. Pretty nifty ;D I used it to filter out やおい and annoying Final ファンタジー characters and it's awesome. あなた can filter out Mature stuff on Deviantart too but あなた can't filter out specific things あなた don't like, like あなた can on Zerochan.net